I loaded up a few 12 gauge loads last night and today. Chronographed them today. The most pertanent was 21.5 gr of Unique. Average was 1197 fps. The velocities were 1170, 1199, 1201, 1196, and 1218 fps. Target 50 ft. Point of aim with my shotgun was the 4 inch target circle with fiber optic bead sight.
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I've settled in on this load for home defense. 2 1/4 inch short shells: Fiocchi hull (cut down from 2 3/4" hulls), Fiocchi 616 primer, 21.6 grains of Alliant Unique, X12X gas seal with mica wad slick, .2 inch felt, .003 in mylar wrap with mica wad slick (Two 0.75x1.125 inch), 12 pellets .30 #1 Buck (1 oz), clear overshot disk, and roll crimped. I'm sure this will be between 1200 and 1215 fps.
Reviewing the gas seals, felt, and wrap from range pick up. Didn't find and cork disk. The 23.5 gr load was probably a little too hot, and represents some of the damaged gas seals. The others look good. Looks like the Mylar wrap did its job.
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I've thought about shot size and effectiveness at typical house ranges. I have more confidence in intermediate sizes (B to F) than numbered birds hot sizes. Still I trust buckshot even more than intermediate lettered shot sizes. I have settled on #1 buck as probably the best compromise. Test show it reliably penetrates 12-18 inches of FBI gel, but it penetrates fewer walls than 00 Buck. With buckshot for home defense, I am all for no plating and not overly hard. It is hard to say with intermediate size (B to F) whether plated is better at closes range. Plating may give it an edge at penetrating deep enough to reach organs.
I did test some 3 inch combo loads with #1 and BBs. My thouhgts at the time was I wanted something that would be a good coyote buster and double for home defense. Something I might load up for the 1st round or two of my home defense shotgun. I might have to revisit this idea.